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  • Artikel  (10)
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  • Artikel: DFG Deutsche Nationallizenzen  (10)
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  • Artikel: DFG Deutsche Nationallizenzen  (10)
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  • Physik  (12)
  • 1
    Digitale Medien
    Digitale Medien
    Free-running ruby laser annealing of boron implanted silicon (1981)
    Springer
    Applied physics 26 (1981), S. 243-246 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.80 ; 42.80 ; 85.30
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract An analytical treatment of the thermal phenomena during free-running ruby laser annealing of boron implanted silicon is presented. The heat equation was solved for a simplified shape of the pulse train consisting of a uniform succession of triangular spikes, identical in energy. During one spike the optical and thermal parameters of the sample were taken constant, but for each new spike, new values of these parameters were calculated taking into account their temperature dependence. Such a model predicts the melting of the top surface before the laser pulse has ended, for energy densities higher than 9×104 J/m2. RHEED confirms the presence of recristallization at about the same value of the laser-pulse energy densities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00617845
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  • 2
    Digitale Medien
    Digitale Medien
    Binding of gas atoms to extended crystal defects in molybdenum studied by positrons (1982)
    Springer
    Applied physics 27 (1982), S. 247-250 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 78.70 ; 61.80 ; 71.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The positron annihilation technique (P.A.T.) has been used in a study of interactions between gas impurities and crystal defects (vacancy loops and voids) in molybdenum. P.A.T. measurements were found to be very effective for this purpose. We propose that the observed effects are due to decoration of the void surface with nitrogen and vacancy loop decoration with hydrogen and nitrogen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619087
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  • 3
    Digitale Medien
    Digitale Medien
    On the inelastic-loss approximation for keV-energy ion collisions in solids (1981)
    Springer
    Applied physics 24 (1981), S. 121-126 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.80 ; 79.20
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Inelastic energy-loss in a single collisionT e and related stopping cross-sectionT e based on the Firsov model are evaluated for different screening functions in the elastic interaction potentials. Various approximations ofT e andS e for keV-ions in solids are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00902267
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  • 4
    Digitale Medien
    Digitale Medien
    Lattice defects of V3Si single crystals studied by positron annihilation (1981)
    Springer
    Applied physics 25 (1981), S. 65-70 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 78.70 ; 61.70 ; 61.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The sensitivity of positrons to point defects created by the irradiation of V3Si with neutrons is demonstrated. We found no indication of thermal vacancies by thermal equilibrium measurement up to 1273 K which indicates that the monovacancy formation enthalpy for V3Si isH 1V F ≧(1.84±0.14) eV. Investigations within the range of homogeneity for excess vanadium suppot the idea that substitutional defects are the dominating defect type, whereas for excess silicon a direct confirmation of existing structural vacancies as the dominating defect type is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00935393
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  • 5
    Digitale Medien
    Digitale Medien
    Calculation of the temperature during electron pulse annealing of silicon (1981)
    Springer
    Applied physics 25 (1981), S. 139-142 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.80 ; 78.30 ; 85.30
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract High power density electron beams offer new opportunities for studies of epitaxial growth of semiconductor materials. Assuming that the mechanism of epitaxial growth can be understood as a surface melting followed by supercooling regrowth, the heat flow equation has been applied to calculate the temperature reached after an electron beam pulse of power density between 0.5–2 J/cm2. Comparison with laser annealing is made.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00901286
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  • 6
    Digitale Medien
    Digitale Medien
    Depth of origin of sputtered atoms (1981)
    Springer
    Applied physics 25 (1981), S. 307-310 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 79.20 ; 68.55 ; 61.80 ; 34
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Estimates are given for the distribution of the depth of origin of sputtered atoms in the low-fluence limit, as well as the corresponding distribution of atoms sputtered into a given energy interval. The former distribution is well described by an exponential profile, with the characteristic depth being consistent with previous results. The latter distribution is characterized by an energy-dependent depth scale and a shape that varies from exponential at low sputtered-atom energies to inverse-power form at higher energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00902988
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  • 7
    Digitale Medien
    Digitale Medien
    γ-Ray (and electron) induced annealing of nuclear tracks in polymeric detectors (1981)
    Springer
    Applied physics 25 (1981), S. 337-345 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 29 ; 34 ; 61.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Energy loss profiles for secondary electrons and γ-rays are discussed and the interactions of γ-rays with the activated species within the core of a nuclear track investigated. Based on an electron-hole trapping mechanism experimental values for the activation energies of annealing for nuclear tracks in the range of 0.26 to 0.5 eV have been obtained. These compare favourably with theoretical expectations. The consequences of variations in the detection sensitivities of such detectors are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00902992
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  • 8
    Digitale Medien
    Digitale Medien
    Energy distributions of low energy H ions backscattered from graphite, stainless steel, and molybdenum (1982)
    Springer
    Applied physics 27 (1982), S. 263-268 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.80 ; 79.20
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Energy distributions of H+ and H− backscattered from graphite, stainless steel and molybdenum were measured for low incident beam energies (150∼1500 eV). The energy distributions of H− resembled that of H+, while the intensity ratio of H− to H+ varied from material to material and with the incident proton energy. A peak in the energy distribution moved to the “cutoff” energy with decreasing incident energy, which can be attributed to an increase in nuclear stopping cross section and a decrease in electronic stopping cross section. The ratio of the peak energy to the incident energy is related to the reduced energy ɛ of incident beam independent of target materials in the measured region (0.03〈ɛ〈 3.3).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619090
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  • 9
    Digitale Medien
    Digitale Medien
    Positron lifetime measurements on electron irradiation damage in amorphous Pd80Si20 and Cu50Ti50 alloys (1982)
    Springer
    Applied physics 27 (1982), S. 31-33 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.40 ; 61.80 ; 78.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Positron lifetime measurements were performed on amorphous Pd80Si20 and Cu50Ti50 alloys irradiated with 3MeV electrons at 20K. The irradiation was found to increase the mean positron lifetime in both specimens indicating the presence of vacancy-like radiation damage. Isochronal annealing between 77 K and 300 K resulted in a continuous reduction of the positron lifetime, which suggests a gradual recovery of the irradiation induced defects.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01197543
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  • 10
    Digitale Medien
    Digitale Medien
    Positron annihilation and Hall effect in electron irradiatedn-InP crystals (1982)
    Springer
    Applied physics 29 (1982), S. 219-223 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.80 ; 71.55 ; 78.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Positron annihilation and Hall effect inn-InP crystals as a function of electron irradiation up to 1 · 1019 cm−2 and post-irradiated isochronal annealing up to 550 °C have been studied. It is concluded that in irradiatedn-InP samples positrons interact with negatively charged acceptor-type defect with level atE c −0.33 eV, probablyV In (primary defect). In post-irradiated isochronal annealed (up to 330 °C) samples ofn-InP positron trapping occurs preferably in secondary defects-vacancy clusters, which are formed in the temperature range (150–300 °C). Inn-InP crystals containing radiation induced defects the trapping rate was found to decrease with temperature in the range (300–77) K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00615071
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